package collection_;

import java.util.ArrayList;
import java.util.HashMap;

/**
 * @Author wly
 * @Create 2023-04-23 15:25
 * @Description:
 */
public class Collection_ {
    public static void main(String[] args) {
        ArrayList arrayList = new ArrayList();
        arrayList.add("jack");
        arrayList.add("tom");
        System.out.println(arrayList);

        HashMap hashMap = new HashMap();
        hashMap.put("NO1", "北京");
        hashMap.put("NO2", "上海");
        System.out.println(hashMap);
    }
}
